Toxic Epidermal Necrolysis

Toxic epidermal necrolysis is a severe condition in which large areas of the skin begin to separate and shed, often quite suddenly. The body's immune system mounts an intense reaction that damages the bonds holding the outer layers of skin together, and this can extend to the mucous membranes inside the mouth, around the eyes, and in other areas. It tends to appear as reddened skin that develops blisters or sheets of skin that peel away, and the affected areas can be painful and vulnerable to infection. Owners most commonly notice widespread skin lesions that seem to appear rapidly, sometimes following medication or an illness, though in many cases no clear trigger is identified. The extent of skin involvement can vary, and areas that look initially inflamed may progress to more obvious peeling or raw patches over hours to days. This page explores the patterns that may raise concern for toxic epidermal necrolysis, the immune and cellular processes understood to drive the condition, how it is distinguished from other causes of severe skin damage, and the range of approaches used to support affected animals while the skin begins to heal.